MYSOLINE vs OPSYNVI

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated October 7, 2026·How we rate

Possible drug interaction. MYSOLINE and OPSYNVI are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

Attribute	MYSOLINE	OPSYNVI
Rating	74/100	New
Pharmacy pays	~$2.89 /30	—
Type	RX	RX
Active ingredient	PRIMIDONE	MACITENTAN AND TADALAFIL
Manufacturer	Valeant Pharm Intl	Actelion
Dosage forms	Tablet	Tablet
Drug class	Anti-Epileptic Agent	—
Boxed warning	None	Boxed warning
Half-life	—	about 16 hours (apparent elimination half-life)
Treats	Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor	—

mysoline opsynvi

Rating

74/100

New

Pharmacy pays

~$2.89 /30

—

Type

Active ingredient

PRIMIDONE

MACITENTAN AND TADALAFIL

Manufacturer

Valeant Pharm Intl

Actelion

Dosage forms

Tablet

Drug class

Anti-Epileptic Agent

—

Boxed warning

None

Boxed warning

Half-life

—

about 16 hours (apparent elimination half-life)

Treats

Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor

—

Frequently asked questions

What is the difference between Mysoline and Opsynvi?

Mysoline contains Primidone, while Opsynvi contains Macitentan and Tadalafil — they have different active ingredients.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.